Does your
1970 car have the trunk prop rod hole in the inside face of the right quarter panel
extension? No? Maybe your quarter extension was replaced due to accident damage. Maybe
your car is 100% original and it came from the factory without the hole? Could be either
case.

Shown
below is the intended location for the prop rod hole in the right quarter panel extension
for the 1970 BOSS 302 Mustang.

There are
two key points to this drawing. First is the note, ".250 DIA HOLE AT ASSY FOR
ATTACHING L/C PROP FOR R.P.O. SPOILER R.H. O...". There is more after that last
"O" but it was cut off when this was copied. Translated to plain English this
note means, "1/4 inch diameter hole drilled at assembly for attaching the luggage
compartment prop for regular production option spoiler right hand only." Yes, this is
another one of those (if you read the radiator support hole page) items drilled by an
assembly worker whenever one of these special (BOSS) cars came down the line. Which means
you can't always trust the humans to do it right 100% of the time. One might hope/assume
there was a special template used on the line to locate and drill this hole. We do not
know if it is true or not. If you know, please tell us. We have not taken the time to
compare a number of cars to see if all the holes are located approximately the same or if
they vary greatly. Should have thought of that at Carlisle, 2005, or Dearborn, 2011.
Please remind us at the next reunion.

The second
key point to this drawing is the vertical dimension ".40" and the horizontal
dimension "3.50" locating the center of the hole. Back when Ford used paper and
pencil to design the car body, the body drawing was overlaid by equally spaced vertical
and horizontal "imaginary" gridlines used for reference. The hole center
here is 0.40 inches measured vertically from the gridline with the "2" in the
circle off to the right of the page and 3.50 inches from something, probably a vertical
gridline, running off the page to the left.

Your car
doesn't have gridlines on it so you do not have a way to measure the hole location like
Ford drew it. If you need to drill this hole, I can suggest a few ways to go about this.

a) Best
idea: Make a template from another car. You can use this drawing to compare how well that
car matches up with Ford's design intent. You can try to use paper but thin, stiff, clear
plastic is best for a template. You can see through the plastic and draw on it. Plastic
cuts pretty easy, too. Plastic will not bend as easy as paper unless you use heavy paper.

b) Might
work idea: Use this drawing to make a template. I measured the 0.40 dimension on my copy.
It measured just a smidgen over 0.40, like 0.41. That means this copy I scanned should be
almost exactly full scale. About as close as you can get. Print and take it to a copy
machine if necessary and play with the copy size adjustments until you can measure that
0.40 EXACTLY on your copy. Then you should have your own paper template. Cut/trim it along
Line V (Body Opening) and check it against the outer surface of the quarter extension. If
it lines up EXACTLY (or at least to your satisfaction) then you should be good to go.
Transfer it to clear plastic if you prefer.

c) Not
recommended idea: Just eyeball it and drill away! Definitely not the best way to make this
hole but, hey, there's "perfect" and then there's "good enough". You
might settle for good enough. At least you have an idea where it should go. Did the Ford
line workers have a template? Did they use it all the time? Did you check some other cars
to see if all the holes were the same? If you do, let us know the results of your survey.
If you want perfection, make a template or pay someone else to do the job. Then you can
blame them and have them pay for a new quarter extension and paint if they ruin yours.

One final
note, there was no bushing or grommet put in the hole after it was drilled. A lot of cars
may have their holes worn open and are now oversized from use after all these years.